go: update go build rules

examples/go/BUILD.gn

 # Copyright 2015 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//mojo/go/rules.gni")
 
 if (is_android) {
   group("go") {
     deps = [
       ":go_echo_client",
       ":go_echo_server",
     ]
   }
 
-  go_shared_library("go_echo_client") {
+  go_mojo_application("go_echo_client") {
     sources = [
       "echo_client.go",
     ]
     deps = [
       "//examples/echo:bindings",
       "//mojo/go:application",
       "//mojo/go:platform_cgo",
       "//mojo/public/c/system",
       "//mojo/public/platform/native:system",
     ]
   }
 
-  go_shared_library("go_echo_server") {
+  go_mojo_application("go_echo_server") {
     sources = [
       "echo_server.go",
     ]
     deps = [
       "//examples/echo:bindings",
       "//mojo/go:application",
       "//mojo/go:platform_cgo",
       "//mojo/public/c/system",
       "//mojo/public/platform/native:system",
     ]
   }
 }